machine tool



Feb. 6, 1940. E. LANGE ET AL 7 21,3434 1 MACHINE TOOL Original vFiledApril 8, 1935 9 Sheets-Sheet 1 ATTORNEYS.

Feb. 6, 1940. i M. E. LANGEQ AL 21,343

MACHINE TDOL Original Filed April 8. 1935 9 Sheets-Sheet 2 INVENTORQ MAX5 AA/vGE Johw J/M MW biwmsmo ATTORNEYS.

M. E. LANGE AL" e: 21,343

MACHINE TOOL Feb. 6, 1 40.

9 Sheets-Sheet 5 Original Filed April 8, 1935 IN VENTORQ M/IX E ZA/vQEBY vb w J/M Kw f/Amemsvao ATTORNEYS.

Feb. 6, 1940. M. E. LANGE ET AL MACHINE TOOL Original Filed April 8,1935 9 Sheets-Sheet 4 INVENTORJ: Ma'- 5 laws: BY dad v J/VMIN/YAMEIRSVA-Zfl ATTORNEYS Feb. 6, 1940. M. E. LANGE ET AL- Re. 21,343

' MACHINE TOOL ori inal Filed A il 8, 1935 9 Sheets-Sheet 6 INVENTORSAMY/was BYc/OH/V J/V MwfihMsflsvao ATTORNEY-5:

Feb. 6, 1940.

M. E. LANGE El AL MACHINE TOOL Original Filed 'A ril 8. 1935 9Sheets-Sheet 1 INVENTORS 'M/IXElA/VGE BY Joy/v J/V MWVfiZ/WERSVElOATTORNEYS Feb. 6, 1940. LANGE U -Re. 21,343

MACHINE TOOL Original Filed April 8, 1935 9 Sheets-Sheet B INVENTORS.

MAX 5 AAA/6 BY Jomv /A./ K4 fiwewsa/ao ATTORNEYJ Fb. 6, 1940. M. E.LANGE El AL.

MACHINE TOOL Original Filed April 8. 1955 9 Sheets-Sheet 9 INVENTORSf/WAXf ZAA/GE vb/m/ J/t/ Mzvfhmsfisrqo .W. 1 l a? ATTORNEYS ReissuedFeb. 6,1940 I Re,

21.34: 'monmn TOOL Max E. Lange and John J. N. Van Hamenlveld. ClevelandHeights, Ohio, assignors to The Warner & Swasey Company, Cleveland,Ohio, a corporation of Ohio Original No. 2,129,280, dated September 6,1938, Serial No. 15,182, April 8, 1935. Application for reissue August17, 1939, Serial No. 290,711

. '15 Claims. or. 29-46) This invention relates to a machine ,tool andmore particularly although not necessarily to machine tools of thelarger types, wherein the operator cannot conveniently and eflicientlycon- .trol the machine from the position he occupies while controlling.the slides and observing the operation of the machine. An object of theinvention is to provide in a machine tool means for selecting orpreselecting the speeds of operation of a movable part thereof and whichmeans is operated from a point remotely arranged with respect to saidpart.

Another object is to provide in a machine tool means for selecting orpreselecting the speeds of operation of a movable part thereof, andwhich means is operated by a single control member remotely arrangedwith respect to said part.

Another object is to provide in a machine tool means for selecting orpreselecting and changing the speeds of operation of a movable partthereof and controlled by means remotely ar-' ranged with respect tosaid part.

Another object is to provide in a machine tool means for. selecting orpreselecting and changing the speeds of operation and for controllingthe starting, stopping and reversing of a movable part of the machineand controlled by means remotely arranged with respect to said part.

Another object is to provide in a machine tool means for selecting orpreselecting and changing the speeds offlperation and for controllingthe starting, stopping and reversing of a movable part of the machineand controlled by a single control member remotely arranged with respectto said part.

' Another object is to provide in a machine tool means for selecting orpreselectingthe speeds of operation of one movable part thereof andwhich means is operated from a point located on another movable part ofthe machine.

A further object is to provide in a machine tool means for selecting orpreselecting and changing the speeds of operation of a movable part ofthe machine and controlled by means arranged on another movable part ofthe machine.

A still further object is to provide in a machine tool means forselecting or preselecting and changing the speeds of operation and forcontrolling the starting, stopping and reversing of a movable part. ofthe machine and controlled by a single control member arranged onanother movable part of the machine.

Another object is to provide in a machine tool hydraulic means forselecting or preselecting and changing the speeds of operation of amovable part of the machine and controlled by means arranged on anothermovable part of the machine.

Another object is to provide in a machine tool hydraulic means forselecting or preselecting and changing the speeds of operation and forcontrolling the starting, stopping and reversing of a movable part ofthe machine and controlled by means arranged on another movable part ofthe machine.

Another objectis to provide in a machine'tool hydraulic means forselecting or preselecting and changing the speeds of operationand forcontrolling the starting, stopping and reversing of a movable part ofthe machine and controlled by means remotely arranged with respect tosaid part. v

Another object is to provide in a machine tool mechanical means'forselecting or preselecting and changing the speeds'of operation and forcontrolling the starting, stopping and reversing of a movable part ofthe machine and controlled by means arranged on another movable part ofthe machine.

A further object is to provide in a machine tool means for selecting orpreselecting and changing the speeds of operation of a movable partthereof, and including a fluid motor having a pluralityof pistonstogether with control valves for said motor, whereby said pistons may beoperated in unison or independently of, each other.

A still further object is to provide in a machine tool means forselecting or-preselecting and changing the speeds of operation of amovable part thereof and for disconnecting said part from its drive andincluding a movable member having an indexing moment, and means forstopping said movement in predetermined positions of said member.

Further and additional objects and advantages 'not hereinbeforespecifically referred to will bework spindle in the head of the machinetool shown in Fig. 1.

Fig. 4 is an enlarged transverse sectional view through the head of themachine tool shown in Fig. 1 and is taken substantially on line 4-4 ofFig. 6, looking in the direction of the arrows.

Fig. 5 is a fragmentary sectional view taken substantially on line 5-5of Fig. 6, looking in the direction of the arrows.

Fig. 6 is a horizontal sectional view taken substantially on line 6-6 ofFig. 4, looking in the direction of the arrows. i

Fig. 6 is a sectional view, on an enlarged scale taken substantially online Iii-1i of Fig. 6, looking in the direction of the arrows.

Fig. 6 is a modification of the clutch and housing shown in Fig. 6 andis on an enlarged scale.

Figs. 6 and 6 are sectional views taken, respectively, on lines 6'=6 andIS -6 of Fig. 6, looking in the directionof the arrows.

Fig. 7 is a fragmentary horizontal sectional view taken substantially online 1-1 of Fig. 4, looking in the direction of the arrows.

, Fig. 8 is a sectional view on an enlarged scale taken substantially online 8-8 of Figs. 2 and 12, looking in the direction of the arrows.

Fig. 9 is a sectional viewon an enlarged scale taken substantially online 9-1! of Figs. 2 and 12, looking in the direction of the arrows.

Fig. 10 is a view similar to Fig. 9 but showing certain of the parts indifferent positons.

Fig. 11 is a sectional view taken substantially on line 11-11 of Fig. 6,looking in the direction of the arrows.

Fig. 12 is a sectional view taken substantially on line 1212 of Fig. 6,looking in the direction of the arrows. I

Fig. 13 is a fragmentary end elevation of the head of the machine shownin Fig. 1 and is taken.

looking from the right-hand side of said view.

Fig. 14 is a sectional view "taken substantially on line 14-I4 of Fig.12 looking in the direction of the arrows.

Fig. 15 isa fragmentary transverse sectional view taken substantially online 15-15 ofFig. 1, looking inthe direction of the arrows.

Fig. 16 is a fragmentary front elevation on an enlarged scale of aportion of the machine tool shown in Fig. 1.

Fig. 17 is a fragmentary sectional view taken substantially on line11-11 of Fig. 16, looking in the direction of the arrows.

Fig. 18 is a fragmentary sectional view on an enlarged scale and istaken substantially on line 1818 of Fig. 1, a-portion of the machine inthis view being illustrated in section taken substantially on line IB-18* of Flg.--20, looking in the direction of the arrows.

Fig. 19 is'a sectional view of aportion shown in Fig. 18, and istaken'substantially on line 19-48 of Fig. 18 looking in the direction ofthe arrows' Fig. 20 is a sectional .view taken substantially on line211-211 of Fig. 19 looking in the direction of the arrows.

Hg. 21 is a diagrammatic view of the fluid motors and the control valvestherefor with the latter being shown in section taken substantially online 21-21 of Fig. 20, the motors also being shown in section and inthesame relative positions as shown in Fig. 2.

Fig; 22 is a sectional view of the left-hand control valves unit shownin Fig. 21 with the parts thereof shown in a different position than insaid F18. 21.

Fig. 23 1s a view similar to Fig. 22, with the parts of the valves unitshown in a still different position.

Fig. 24 is a sectional view of the control valves unit shown at theright of Fig. ,21 with the parts of the valves unit in a differentposition than in said Fig. 21.

Fig. 251s a view similarto Fig. 24 with the parts of the valves unit ina still different position.

Fig. 26 is a view similar to Fig. 18, but illustrates a modifiedembodiment of the invention from that previously illustrated.

Fig. 27 is a fragmentary side elevational view looking from theleft-hand side of Fig. 26, and

Fig. 28 is a fragmentary top plan view of Figs. 26 and 27.

The machine tool shown in Fig. 1 comprises a head 35 in which isarranged a rotatable work spindle 36, while horizontal ways 31 extendfrom the head along the bed of the machine and have, in this instance,two movable parts 38 and 39 arranged thereon, said partsconstituting acrossslide and a turret. slide.

The work spindle 36 in the head 35 may be driven from a suitable highand low speed motor (not shown) through a pulley 40 which is operativelyconnected with the spindle by means of clutches and speed change gearsnow to be described.

Referring toFig. 3, 11-. will beseen that the pulley 40 is mounted on ashaft 40, rotatably arranged in the head 35 and carrying freelyrotatable friction clutch members 40 and 411 of the disk type and ashiftabl'e clutch member 411 splined to the shaft 411 to rotatetherewith and move endwise thereon and engageable with either of theclutch members 411 and 111 so as to impart forward and reverse movementsto the work spindle through gearing to be explained. The clutchmember40" is provided with a gear 411 which constantly meshes with a gear 41fixed to the shaft 41, so as to impartfoi'ward movement to the workspindle. The clutch member 40 is provided with a gear 111 whichconstantly meshes with an idler gear 41! which, in turn, constantlymeshes with a gear 41 fixed to the shaft 41 to impart reverse movementto the work spindle.

It will be seen that the shiftable clutch member 411 can be engaged witheither of the clutch members 40 or 411' to drive the shaft 41 in forwardor reverse. directions, or the clutch member 40'' may be disconnectedfrom both clutch members 40 and 411 to disconnect the drive to the shaft41.

A- three-step gear cone composed of gears 41 41 and 41 is splined to theshaft 41 to rotate therewith and slide thereon, said gear cone beingarranged intermediate the gears 41 and 41 on the spindle 36 but which isheld against endwise movement thereon as is well understood in the art.The sleeve 43 is also provided with a. gear 43*, the gears 13 and 43beingadapted. to mesh, respectively, with gears 44 and 44' forming arear two-step gear cone splined to a shaft 44 to rotate therewith andmove endwise thereof. It will be seen that the shaft :14 can be operatedgear cones already described.

The shaft 44 is provided with a second or front two-step gear conehaving gears 44 and 44" thereon, this latter two-step gear cone likewisebeing splined to the shaft to slide thereon and rotate therewith. Thegears 44" and 44 may be meshed, respectively, with gears and 11 35 fixedto the work spindle 36, wherefore the spindle 36 may be driven at anyone of twelve speeds in the forward and reverse directions through thethree-step gear cone and the two two-step gear cones, and since themotor which drives the pulley 40 may be operated at high or low speedsthe spindle 35 therefor will have two series of operating speeds oftwelve speeds each in both the forward and reverse directions.

Referring to Fig. 4, it will be seen that the shiftable clutch member40' is shifted by means of a yoke carriedby'a sleeve 45' (see Fig. 6)that is slidably mounted on a rod 45 supported in brackets carried bythe cover 35' of the head. The sleeve 45' is provided with a pair ofspaced lugs between which extends the end of a lever 46 which is fixedto the lower end of a vertically extending shaft 41 rockably supportedin the cover 35' of the head and having a lever 41' secured theretoabove the cover.

'I'hethree-step gear cone on the shaft 4| is shifted to-..any one of itsthree operative positions by meanspf a shoe straddling the middle gear4|? of the cone and formed integral with a sleeve 48 which is endwiseshiftable on a rod 49 which forms the support for the idler gear 40'.

The sleeve 48 is provided with a lateral exten- The rear two-step gearcone on the shaft 44- is shifted by means of a shoe straddling the largegear 44 thereof and carried by a lever arm 52 freely rockable on theshaft 5| and arranged above the lever 50. i

The front two-step gear cone on the shaft 44 is shifted to either of itstwo operative positions or to an inoperative position by means of a shoestraddling the gear 44.and carried by a lever arm 53 fixed to the lowerend of a rockable vertically extending shaft 54 carried by the cover 35of the head .(see Fig. 5). The machine as thus far described embodiessubstantially conventional structure which per se forms no part of thepresent invention.

As previously stated the present invention relates to means forselecting or preselecting and changing the speeds of operation of amovable part of a machine tool together with means for controlling theselection or preselection and speed changing and which is located 'at apoint remote from the movable part referred to.

Reference will now be made to the means for selecting or preselecting'and changing the speed of operation of the movable part of the machinetool, in this instance the spindle in the head thereof, but inasmuch assaid selecting or preselecting and said speed changing means now to bereferred to is substantially the same as that shown in the copendingapplication of Max E. Lange, filed February 26, 1935, Serial No. 8319,now Patent No. 2,068,552, issued January 19, 1937, it is not believednecessary to describe such means in great detail.

A shaft 55 is rotatably mounted in the cover position, wherein the workspindle is disconwhen the spools are moved endwise equal distancestoward each other to shift the levers 50,

52 and 53, which, in turn, shift the gear cones as previously'described.Arranged on opposite sides of the shaft 55 and spaced equally therefromare parallel rods 51 upon which slide sleeves 58 and 58'. in. a groovein the spool 55, while the sleeve 58' carries a yoke engaging in agroove in the spool 55', wherefore it will be seen that when saidsleeves are moved in opposite directions upon the rods 51, the spools 55and 55' will be moved end- 2 wise away from each other, while when saidsleeves are moved in the opposite direction the spools will be movedendwise toward each other. When the spools 55 and 55' are moved endwisetoward each other the cooperating projections 2 carried on the adjacentsides of the spools engage the pins 5l', 5| and 52'.

The sleeves 58 and 55' are simultaneously moved in opposite directions'an equal distance to move the spools 55 and 55' equal distances towardand from each other bymeans of an equalizer bar 58 integral with avertical shaft 55 rockably supported in a boss formed on the upper sideof the head cover 35' (see Fig. 4).

The bar 55 is provided at its opposite ends with shoes 58' which arelocated in slots extending transversely of upwardly extending portionsof the sleeves 58 and 55', (see Fig. 6). The upper end of the shaft 58has secured thereto a lever 58, wherefore, when said lever is rocked thebar 58F will be rocked and the sleeves 55 and 58' and the spools 55 and55' will be moved in opposite directions equal distances.

/"I'he pin 51' is carried by a lever 5| which is loosely mounted on theshaft 5| and has pivoted to its outer end a. link 5| in turn pivotallyconnected to a lever 54' which is fixed to the shaft 54 (see Figs. 4, 5and 7). It will be seen that when thepin 51' is moved by the projectionson the spools 55 and 55' that the shaft 54 and the lever 53 connectedthereto and having a shoe straddling the front two-step gear cone willbe shifted to move said cone to either one of its two operativepositions or to a neutral inactive nected from its drive train. The pin5| is carried by a lever 5l which is fixed to the shaft 5|, wherefore,when the projections on the spools engage the pin 5| and move thelatter, the lever 50, fixed to the lower end of the shaft 5|,

will be moved to cause a shifting of the threein the different positionsto which they amt-'70.

shifted. v v

The spools 55, 55' may be moved endwise away from each othersufliciently far to clear the pins 5l', 5|" and 52', after which thespools can be 1 indexed to bring different sets of projections into Thesleeve 58 carries a yoke which engages l 4 position to la uponthe plus,but preferably the spools are given a'slight additional movement endwiseafter clearing the pins and before the indexing of the spools for areason later to be explained. v

Inasmuch as the work spindle 36 in the present illustration has twelvedifferent speeds in both forward and reverse directions, in addition toa neutral position, in which the fronttwo-step gear 7 none isdisconnected from the spindle for the purposes of loadingandunloadingpthespools 66 and 56- are provided with three series of i3projections each or with a total number of thirtynine projections whichcooperate with the pins 6|, 6|" and 52 to effect movement thereof toshift the gear cones to obtain the various speeds and the neutral\position as fully explained in 'Lange application Serial No. 8319, nowPatent No. 2,068,552, issued January 19, 1937.

The indexing of thespools is accomplished by giving rotative movement tothe shaft 55 in a manner later to be explained, it being noted, however,that theshaft 66 at one of its ends is provided with a spiral gear 55which meshes with a similar spiral gear 59 fixed on a shaft 59 rotatablymounted in the cover and extending beyond the front side thereof andhaving fixed to its extended end a dial 66 (see Figs. '1 and 11).

The periphery of the dial 60 is provided with four series ofcircumferentially spaced openings 66, it being assumed for p p ses ofillustration that there are four operative steps required upon the workpiece, thus requiring four different spindle speeds in each operativecycle. Each series of openings 66' contains twelve circumferentially'spaced openings corresponding to the twelve spindle speeds.

Since the shaft 66 is connected to the shaft 65 with a one to one ratio,it will be understood 'that one complete rotation of the dial 66takesplace for a complete rotation of the spools 56 .and 66'. It will beunderstood also that eachof the twelve openings in the four series ofopenings in the dial represents a different spindle speed and theopenings correspond to the cooperating projections on the spools 66 and66'. Each series of openings 60' is provided with a pin 60 which may bearranged in any one of the openings in the series and held therein by a,locking pm 66, as clearly shown in Fig. 11. A

face plate 66 is held on the front of the dial by a knob 60 and coversthe hads of the locking pins 66", said plate being provided with indiciain line with the openings 66' and corresponding to the different spindlespeeds and neutral pomtion (see Fig. 1"); It will be understood that thepins 66 are positioned in the various openings 66', which correspond tothe required speeds of operation for the spindle foreach step during theoperative cycle. I

The pins 66 are adapted to successively contact with a stop pin 6| asthe dial rotates, which stop pin is moved step by step from an inactiveposition, as shown in dotted lines at the left side oi Fig. 14, to fiveactive positions, A, B, C, D, and E, in the first four of which, namely,posi-.

' tions A, B, C, and Bit is engaged by the removin the fifth position,namely, position E, it is engaged by a fixed pin 6!] carried by the dialfor the neutral position of the work spindle when the front two-stepgear cone is-disconnected therefrom. Itwill be understood that when thepins 66 and 60 engage the stop pin II the rotation oases ofthe am 66andthe spools and liisstopped and the spools are thus indexed and heldin such positions that when the spools are moved inwardly the pins 6|,6| and 62 will be moved by the projections on the spools to shift thediiferent ear cones to obtain the desired speeds of operation of thework spindle. The dial and spools may be held in the different positionsby suitable detent means, such as the star wheel and roller.

arrangement shown in said Lange Patent No. 2,068,552, and hence notillustrated herein.

The stop pin 6| is moved from its inactive position to its five activepositions by mechanism now to be described. The pin 6| is carried by aslide 62 mounted in a bracket 62" secured to thefront side of the cover36' of the head, said bracket having a recess housing the slide 62,which recess 6! projects, whereby a rigid support isprovided for theslide so that the slide-will be capable of taking the slight blowsimparted to it when the pin 6| is contacted by the pins.6ll and 66*. The

is provided with a slot through which the pin slide 62 is moved inwardlyand outwardly in the recess in the'bracket 62 to bring the pin 6| intoto the slide 62 and extending parallel to the rods 61 and adiacent tothe left-hand rod 51, as viewed'in Figs. 4 and 12.

' The bar 64 is provided at each end with re duced portions 64 and 6 4,the portion 64* being. in the form of a sleeve extending into a tubularbushing 65 carried by the cover which bushing and the portion 64 house aspring 65 which at all times tends to move the notch bar 64 toward theright as viewed in Figs. 9-and 10. The

notch bar 6| is held" against turning movement by means of a pin carriedby the bushing 65 and engaging in a longitudinal slot in the sleeveportion 66', see Figs. 6, 9 and 10. The

portion 64 of the notch bar 66 extends into a two-part sleeve 66 whichis movably mounted in a bore in the cover 36' so as to be capable ofsliding endwise therein. The outer part of the two-part sleeve 66 isprovided with a head 66 adapted to abut the outerside of a bracket 61secured to the cover 66* to limit the movement of the two-part sleeve inan inward direction withrespect to the cover. A spring 66 surrounds theouter part of the twopart sleeve 66 and abuts at one end the end of theinner part of said sleeve and at its opposite end the inner shoulder ofthe bracket 61, said spring acting to normally hold the two-part sleeveinwardly of the cover with the head 66' in abuttingengagement with thebracket 61 as viewedin Fig. 9.

A'stop rod is mounted in the two-part sleeve and can be adjusted to andheld in various positions therein by means of a locating pin 66' whichextends through an opening in the head .of the stop rod 66, at whichtime, if the innermost hole "Hn the' stop. rod 66 is engaged by thepositioning pin 66', the slide 62 will be in its P sition.

In cases where only three operative speeds in a working cy'cle need'begiven to the spindle the locating pin'88" would be positioned in thenext or second opening 88 in. the stop rod 88, wherefore the slide 82when the notch bar 84 is in the position shown in Fig. 10 would move toa position where the stop pin8l is in position A shown in Fig. 14 andwill be in alignment with the first row of openings 58 in the dial 88,it being understood that the first row of openings will not have a pinpositioned therein in this instance because only three spindle speedswill be re- 8I is now'an inactive position, while positions B, C, D andE are active positions since the stop pin 8|, in such positions isengaged by pins 88 in the three inner series of openings 88 of the dialand by the fixed pin 88 t The sleeve 58 onthe rod 57 is provided with anextension 58 upon which is slidably supported a pawl carrying member 88provided with a pivoted pawl 88" normally urged in a downward directionas viewed in. Fig. 8, by a spring 88". The member or slide 88 isprovided with a twopart bore, in the larger portion of which a coilspring 88 is housed, which spring abuts at one end '01 collar 58'screwed to the threaded end of the extension 88 The spring 88 acts tonormally urge the member 88 toward the left, as

viewed in Fig. 8, or into a position wherein the member so will. shutthe right hand side of the sleeve 58 and the upstanding portion thereof}which receives the shoe carried by the equalizer bar 88!, see-Figs. 8and 10. The said upstanding portion oi the slide 58 is provided with apin 58", whlchengages'in' the smaller portion 01' the bore in the member88 and' holds the member against turning movement on the extendedportion 58 of the sleeve.

Assuming that the sleeve 58 is in the position shown in Figs. and 9, itwiil'be noted that the bearing pin 01 the pawl 88' has engaged with astationaryabutting pin 18 carried by the cover 85'. It will beunderstood that as the sleeve 58 and the member 88 were moving topositions shown inFigs. 8 and 9, the bearing pin of the pawl 88"eng'agedthe pin 18, wherefore the member 88 was held against further movement tothe left,' as viewed in the drawinga'while'the sleeve 58 continuedsuch'movement until it abutted the cover 85 The additional movementtoward the left of the sleeve 58 while the member-A58 was heldstationary by the pin 18 acted decompress the spring 88 and to separatethemember 88 from the sleeve 58 a distance, as indicated in Fig. 8,for apurpose later to be described.

Now assuming that the sleeve 58 is moved from the position shown in Fig.8 toward the" right, as viewed in the drawings, it will be seen thatduring the first part oithis movement the spring 88, which has beencompressed,.holds the bearing pin ofthepawl -88 in engagement with thefixed pin 18 and holds the member 88 stationary until the spring hasexpanded and the sleeve 58 comes into abutting relationship with theleft-hand side of the member 88, after'which the continued movement ofthe sleeve 58 to the right moves the member 88 in unison therewith andcarries the bearing pin of the pawl 88' away from the stationary pin 18,until the collar 58' abuts with the boss on the inside of thecover 35;atwhich time the parts are in the position shown in Fig. 10. During thetime that the qulred and, therefore, position A of the stop pin i amember a is moving in men with the sleeve 58 toward the right, the pawl88' rides up upon a wedge bar Ii which overlies the notch bar 84 and hasits right-hand portion adJustably housed in the cover 88', it beingnoted by reference to Fig. 9 that the right-hand portion 01 the wedgebar H is provided with an upwardly extending end straddling a grooveformed in an adjustable two position screw li carried by the bracket 81.It will be noted that in Fig. 18 the notch bar 84 is shown in itsextreme right-hand position and that the left-handnotch of the sixnotches 84 formed on the upper side or the notch bar is cated beyond theend of the wedge bar 1| and the wedge bar is in its most right-handposition with its upwardly extending end abutting the inner side of thebracket 81, (see Fig. 9).

In those instances where it is desired to actuate the dial 88 manuallythe adjusting screw 'll' is turned until the shoulder carried by itshead abuts the outside or the bracket 81, at which time the wedge bar IIhas been moved inwardly to a position where it will cover all of thenotches 84 on the upper side of the notch bar 84 when the latter is inits 'most right-hand position as shown'in Fig. 10, and hence the pawl 88will be rendered inactive'and will not engage in any of the notches toproduce movement 01' the notch one notch bar 04 being in its mostright-hand position, as shown in Fig. 18, and the sleeve 88 being movedto the left or to spool opening position, it will be .seen thatthe'member 88 and sleeve 88 will move in unison during the first portion oi.the movement of the sleeve and that the pawl 88 carried by the memberwill ride along the top of the wedge bar H until it reaches the endthereof, whereupon it will be urged by its spring into the left-handnotch 84 01- the notch bar, aiterewhich the notch bar 84 will be movedby the pawl and member toward the left, it being understood that thespring88 is stronger than the spring 88", until the stationary pin I8engages the bearing pin 01' the pawl 88 and stops tinues a shortdistance to move the spools to their most outward position and until itabuts the boss on the inside oi the cover 88', the spring 88 being.compressed during this movement by the collar ,88'. notch bar84*occasioned by the engagement oi the'pawl or acts through the bellcrank s: to

shift the slide 82 to move the stop pin 8| from its left-hand inactivedotted line position in Fig. 14 J to. its first active position A. Asthe-notch bar 84 is moved by the pawl 88 the end of a pivoted pawl 12arranged below the notch bar comes into registry with the first notch ofa series 01' notches- 84 on the 'underside'oi the bar and said pawl I2is urged into engagement withthe said notch by its spring to" hold thenotch bar.

in its advancedposition and against its tendency to move to the rightbecause 01' the spring 85' which has been compressed by the movement ofthenotch bar toward the left. The spools 58 and '58 are now in theirmost outward position and the stop pin8l, as previouslystated, is inposttion A. The spools are now indexed to select or preselect thedesired speed, and during the indexing oi the spools the dial 88 turnsuntil the pin 88, carried by the first series of openings in the dial,abuts the stop pin 5| in position A and The movement of the thus locatesthe spools and dial in their properly brought inwardly to shift the gearcones and ob tain the selected or preselected speed. During this inwardmovement of the spo'ols the sleeve 58 first moves independently, as hasbeen previously explained, while the member 89 remains stationary. Assoon as the sleeve I8 abuts the member 69 the latter moves in unisonwith the sleeve to",

ward the left until the collar 58' abuts the boss within the cover 35,during which time the pawl 69 will have ridden upwardly upon the wedgebar H. Inasmuch as the notch bar 84 has been moved one notch to theleft, it wfllbe understood that the second notch from the left-hand endof the series of notches 84 is now located beyond the beveled end of thewedge bar II.

when the next speed is to be selected or preselected and the spools aremoved to their most outward position, the member with its-pawl 69 againmoves with the sleeve 5! until the bearing pin of the pawl engages thestationary pin Ill, but just prior to this time the pawl 89' has riddenoff of the wedge bar II and has engaged in the second notch 84 of thenotch bar 84 and caused a movement of the latter one notch to the left.

As the notch bar 64 moves one notch to the left the pawl I2 rides out ofthe left-hand notch 84 and snaps into the second notch 81 The movementof the notch bar one notch to the left again causes a movement of theslide I2 to shift the stop pin ill from active position A to activeposition B. Now when the spools are indexed to select or preselect thesecond spindle speed the dial rotates and the pin 60 carried by thesecond series of circumferentially spaced openings in the dial willengage the stop pin [I in active position,

B and position the spools and dial in the desired way for obtaining saidsecond speed.

/ This operation is continued until the last speed in the operativecycle has been selected or pre selected and the stop pin II which is nowin position D has been engaged by the pin 80'! carried by the dial inthe most inward series of openings. At this time when the spools areagain moved to their most outward position to select or preselect theneutral position of the work spindle, the pawl 69 will engage in thelast or right-hand notch 64 tyno etlfe' notch bar one notch to the leftand to shift the stop pin 8| from position D to positionEi At this timethe parts are in the positions shown in Fig. 9 and it will be. notedthat the pawl 12 is rendefedinactive. The step by step movements whichhave been imparted to the notch bar 64 to shift the pin 6| to positionsA, B.

C, D andE have compressed the spring 8!, and when the pin 6| has beenshifted to neutral position or position E, a heel ll, carried on theunderside of the right-hand end of the bar 86, has

come into enga'igementwith a pawl II and swun the same from the positionshown in Fig. l0 to that shown in Fig. 9, wherein a locking ton 13*,carried by the pawl 13,.engages with a notch in the end of the pawl 12to render it inactive.

After the spools and dial have rotated until the fixed pin 60 comes intoengagement with the stop pin- 6! in position 1!! and the spools aremoved inwardly to shift the gear cones to disengage the front two-step.gear cone fromthe spindle, the pawl 65 moves to the right as previouslyexplained, and since the notch bar 64 is not restrained by the pawl 12,it will move with the pawl 69 until the latter rides upon the wedge-her511, at which time the notch bar '4 is freed and thespringliwillshiftthelattertoitsmost right-hand position, or until the end of theportion 04'' abuts the stop rod 08 as shown in Fig. 10. During 'themovement of the notch bar 64 to its most right-hand position the slide62 has Been moved outwardly by the bell crank 63 and the stop pin I hasbeen shifted from position E to its left-hand inactive dotted lineposition, .as

moved to disengage the tongue 13' from the notch in the pawl I2 torender the same active. The movement of the pawl I3 is occasionedby theengagement of the extension 64" with the stop rod 68 under the action ofthe spring 85 which moves the two-part sleeve 88* in a direction tocompress the spring ll", wherefore a downwardly extending arm on thetwo-part sleeve exerts a pull upon a link 13 connected to the pawl 13,said link having'a head lying on the right-hand side ;of the downwardlyextending arm of the twopart sleeve, as clearly shown in Figs. 9 and 10.

As has been previously stated, after the spools have been moved to theirmost outward position, they are indexed to select or preselect the nextspeed of operation or the neutral position of the work spindle. Themeans'for causing the indexing of the spools will now be described.

Thesleeve I8 is provided with a downwardly extending portion I! havingatits lower end a .fork which straddles a rod 14, provided at its endwith a shoulder H (see Figs. 6 and 12). The rod ll extends through thewall of the cover of the head into a clutch housing II on the end of'themachine and carriesat its end within the housing 15 a forked portionstraddling a lever arm 16,

formed integral with a sleeve II that is-rockably supported upon a rod11 carried by the housing I! (see Fig. 6*). A spring I0 is arrangedon'the rod ll between the cover 3! and the forked portion at the'end ofthe rod and acts to urge the rod 14 outwardly with respect to thehousing 15. The sleeve II is provided with two integrally spacedleverarms li and 16, which carry at their ends shoes engaging in acircular groove formed in a shii'table clutch member 18 that is splinedto a sleeve extension formed on a worm wheel I9, which worm wheel "I!and its-extended sleeve are freelyrotatable on an extension of theindexing shaft 55 which carries the spools 56 and 58*. A disk is pinnedto the extension of the shaft 55 within the housing I! and has on itsouter face an annular recess carrying a friction ring 80': which has apin connection with the disk ll so as to rotate therewith and havemovement endwise thereof. Thedisk Oil and, ring 8i! are housed within aclutch member 8|, having on its face clutch teeth adapted'to engageclutch teeth on the face of the clutchmember 18 on the sleeve extensionof the worm gear". The clutch member ll is freely rotatable on the disk80, but is held against endwise movement with respect thereto by ashoulder plate 8 l'. The friction ring flll'nis urged into frictionalengagement with the wall of the clutch member 8| by means of a rplurality of springs 80, wherefore said clutch member 81, friction ring80! and disk 80 rotate in unison.

The worm wheel 1! is driven from a worm shaft 82 having a worm B!"meshing with the worm wheel and carrying a bevel pinion 82' which mesheswith a bevel pinion SI fixed on the inner 7 end of a stub shaft 88rotatably mounted in the housing 15, said shaft 88 having on its outerend a pulley 88 which receives a belt that extends around a pulley 88 onthe pulley shaft lil. Inasmuch as the pulley shaft 88 is diven at aconstant speed it will be seen that the worm wheel 18 and its sleeveextension and the clutch member 18 splined thereto are also driven at aconstant peed. A

When the machine is operating and the spools I8, 58'- are being movedtoward their most out-. ,ward position, the rod 18' will slide freelythrough the downwardly extending portion 58' of the sleeve 58 until saidportion engages the shoulder 18 on the rod, whereupon the furthermovement of the sleeve 58 will cause the rod to be drawn into the coverof the head against the tension of the spring 18 with the result thatthe lever arm I8- and the sleeve 18 are rocked in a direction such thatthe lever arms 18" and 18 shift the clutch member 18 to bring the clutchteeth thereof into mesh with the clutch teeth on the clutch member 8|,at which time the shaft 55 will be rotated through the clutch member 8|and disk 88 to cause a rotation of the spools and of the dial 58. Therotation continues until one of the pins 88 or the fixed pin 88' comesinto engagement with the stop pin 8|, whereupon the movement of the dialand shaft 58 with the spools thereon is arrested, a slippage between thefriction ring 88' and the clutch member 8| taking place at this time anduntil the spopls 58, 58 are brought slightly inwardly to disengage thedownward extension 58 from the shoulder 18' of the rod 18 to allow thespring 14" to-move the rod to cause a movement of the clutch member 18to disengaged position. I

It will be seen from the description of the clutch disclosed inFigs. 6and 6 that-the clutch y members 8| and 18 remain engaged until thedownward extension 58 on the sleeve 58* from,

the shoulder 18' of the rod 18.

In Figs. 6, 6 and 8' a different form of clutch is illustrated from thatjust described, and this modified form of clutch is such that the clutchmembers are engaged lwhen the spools are moved to, their mostoutwardposition, as in the clutch just above described, and remainengaged for one complete revolution, even though the spools areimmediately moved toward their inward position'the slight distanceformerly employed to 'fii'disengageth'e clutch member 1a. The modifiedThe modified form of clutch is housed in a.

clutch housing 15'' and is driven from the pulley 88 by the stub shaft83 carrying at its inner end a bevel gear 83 which meshes with a bevelgear 82' on a worm shaft 82 having a worm 82 fixed thereto and meshingwith a worm wheel 84 which, in this instance, freely rotates on theshaft 55 and has on its inner face clutch teeth 84, the worm.wheel 84being driven at a constant speed, as was the worm wheel in thepreviously described form of clutch. A disk 85 is splined on the shaft55 to rotate therewith and slide axially thereon, which disk carries aTriction ring pinned to the disk 85 torotate therewith but move endwiserelative thereto, said friction disk 88 being moved under springpressure into frictional engagement with a clutch member 81 whichhouses, bymeans of a shoulder plate 81, the disk 85 and ring 88, and hason its outer face clutch teeth 81' adapted to intermesh with the clutchteeth 84' on the worm wheel riphery with a cam block 81, whichcooperates with a roller 88' carried by the upper end of a bell cranklever 88 (see Fig. 6

ward the clutch member 81, so that the roller 88 ordinarily lies in thepath of the cam block '81" as the clutch rotates. The roller 88' iscarried by one arm of the lever 88, while the other arm thereof,indicated at 88, extends upwardly and outwardly at an angle from thepivot point of the lever and cooperates with a conical shoulder 88'formed on a rod 88 which, in function, is similar to the rod 18previously referred to.

' The rod 88 at its end which is within the cover of the.head isprovided with a shoulder 86*, while within the clutch housing 15 aspring 88 arranged on the rod and engaging an abutment collar thereonacts to normally urge the rod outwardly into the clutch housing- Thelever 88- is normally urged by a spring 88 inwardly to- The downwardextension 58 .01 the sleeve w straddles the rod 88and when the sleeves58, 58'- are moved in a direction to open the spools 58,

58", the extension 58 moves to the left, as viewed in Fig. 6, andengages with the shoulder 88'' to move the rod 88 against the action ofthe spring 88, which movement by means of the conical shoulder 88 rocksthe lever 88 in a clockwise direction to retract the roller 88i'rome'ngagingposition with respect to the cam block 81''. As' soon as theroller 88 has been withdrawn from the cam block 81", the spring 88 movesthe -clutch ,meniber 81 and disk 85. toward the right, as viewed in Fig.6, and brings the clutch teeth 81into intermeshing relationship with theclutch teeth 84 on the constantly rotating worm [Wheel 84, whereupon,through the friction ring 88, the disk 85 and shaft 55 aredriven fromthe worm wheel.

'As soon as the clutch members have .beenengaged the spools may be moveda slight distance, inwardly, whereupon the shoulderfSli is disen=gaged-from the downward extension 58 on the sleeve 58' and the rod 88 ismoved by the spring 88 in a direction to release the conical shoulder 88from the lever 88 and allow the spring 89" to swing the lever to aposition where the roller 88 l'ies in the path of thecamblock 81'' onthe rotating clutch member 81 (see Fig. 6). It will be seen that whenthe clutch member 81 has made a complete revolution the cam block 81'again contacts the roller 88' and the clutch mernber 81 being inrotation will be cammed toward the left, as viewed in Fig. 6, todisengage the clutch teeth 81*? from the clutch teeth 84 and arrestfurther rotation of the clutch member 81, disk 85 and shaft 55. Theroller 88 now acts in conjunction with a pawl 8 I, now to be referredto, to restrain the clutch member 81 against movement by'the spring 99'until it has again movement endwise thereon, said sleeve being beenwithdrawn from the cam block by'a move-' ment of thespools to their mostoutward position. After the clutch member 91 has made a completerevolution and the cam block '91 has come'into contact with the roller99, the bell crank pawl 9| snaps into "engagement with the underside ofthe cam block 91! under the action of a spring 9|, while the clutchteeth 94' and 10 -81 are substantially separated, and together with theroller 99 holds the clutchmember 81 in such now acts as a wedge betweenroller 99 and pawl 9|, wherefore clutch member 81 is effectively heldagainst rotationand endwise movement.

It will be-understood that when the roller 99'? is withdrawn fromthe camblock 91* and the clutch member 91 rotates, that as the cam block 9!comes into engagement with the pawl 9| the latter will be rockedoutwardly and will slide over the cam block 91? until it is free to snapin beneath the under edge thereof, when the cam block 91 has reachedaposition relative to the roller99 as shown in Fig. 6.

It will be noted that although the clutch is engaged by the-operator bymechanism later to be described, it is automatically disengaged without.the attention of the operator, after making a complete revolution. Itwill be further under-' stood that as the clutch member rotates througha complete revolution the shaft 99, spools 59, 96*, and the dial 99 aremoved untilthe pins 99" or 69. come into contact with the stop pin 81,whereupon the movement of the dial, shaft 55 and the spools thereon isarrested and a slippage beof one complete revolution since the spoolsand dial need to be rotated at all times only a portion of a completerevolution. The mechanism for controlling the selecting or preselectingand speed changing devices and the starting, stopping andreversing ofthe operation of the spindle from a remote point will nowbe described.

Referring to Fig. 1, it will be seen that on the front side of themachine tool a pair of shafts Hand 93 are provided adjacent the usualfeed J shaft 31-, and that saidshafts are supported by a bracket 94which retains the same against endwise movement, and by the apron 39 ofthe cross-slide and the apron 99 of theturret slide.

The-aprons 99 and 99' support the has been stated, but may have movementrelashafts as tive thereto axially of-tlie shafts, and it should benoted that the shaftsfare of such length that they will always besupported by the aprons even though the slides are in their mostrearward positions. J

.The shafts s2 and a: may be rocked individually by means of a lever 95.which is the control 96 (see Fig. 15) carried by a sleeve 9B splined tothe shaft 93 to rock therewith but tohave threaded on its outer side andextending into a threaded connection ween the sleeve and boss permittingthe sleeve and the U-shaped member 96 to rock relative-to the apron butto move endwise therewith and to rockthe shaft 99. The control lever"extends through a slot 91 formed in a? bracket 91 which is secured to apair of supporting pins 9! that extend into comparatively longbossesformed in the apron 38, wherefore it will be seen that said bracket 91is in the form of a slide which can be moved in an axial direction withrespect to the shafts 92 and 93 and relative to the apron 38 When thecontrol lever 95 is moved from the full line position in Figs. 16 and1'? to the dotted on the apron 99, the threaded line position F, thebracket 91 is moved from the full line to the dotted line position,wherefore a link 99 which is pivotally connected to the bracket 91 andto an upwardly extending lever 99* formed on the end of a sleeve 99, isbrought from the full line position to the dotted line position, asshown in Fig. 17, -in which latter position said link is arranged atright angles to the sleeve 99 and, therefore, causes a rocking movementto be imparted to said sleeve through the lever 99. The sleeve 99 issplined on the shaft 92 to rock therewith and to move endwise thereon,said sleeve being threaded and extending into a boss formed in the apron38 similar to the manner in which the sleeve 99' extends into itssupporting boss, with the boss for the sleeve 99 somewhat longer thanthe boss for the sleeve 969, as viewed in Fig. 17. As in the case of thesleeve 96, the threadedengagement between the sleeve 99 and its bossallows said sleeve and lever 99 to rock relative to the apron and tomove endwisetherewith and to rock the shaft 92.

The rocking of the shaft 99 controls the clutch member 49 to engage thefriction clutches 40 and 49 for starting, stopping and reversing theoperation of the spindle 39, it being noted by reference to Fig. 15,that when the lever 95 is in the full line position the clutch F isengaged for forward operation of the spindle, while when it is in dottedline position N the operation of the spindle has been stopped and theclutch is disengaged, while in dotted line position It the clutch I9".is engaged for reverse operation of the work spindle.

The rocking of the shaft 92 controls the end- -wise movement and theindexing of the spools and dial and the shifting of the gear cones. Inother words, the niovementof the shaft 92 com ing'device. i

Referring to Fig. 16 when the lever 95 is in its full line position thespools are in their most inwardj position after having shifted the gearcones,.- and whenit 'is inrdotted line position G the spools have beenmoved partly outwardly a distance sufllcient to clear the gear shiftingpins,

" but at this time the clutch for theindexing shaft 99 is not engaged.when the lever 95 is in dotted line-position F, the spools are in theirmost outtrols the selecting or preselecting andgear chang- I i wardposition and the clutch for indexing the spoolsand dial has beenengaged;

The shaft 92 adjacent the bracket 94 has connected thereto a leverlIllL'which has at its upper end a forked portion straddling one end ofand pivotally connected to arod llll, which extends through openings inthe bed of the machine. The

opposite end of the rod llii projects outwardly of the bed and pivotedbetween the forked por- 21,848 tion of one arm of a bell crank lever I02pivotally carried on a suitablebracket secured to the bed, the other armof said bell crank lever being in the form of a fork with each portionof the fork pivotally connected to valve rods I03 and I04.

The shaft 93 on the side of the bracket 94 opposite to the side on whichthe lever I is mounted on the shaft 92 has secured thereto a lever I05having a forked upper portion straddling and pivotally connected to oneend of a rod I06 which extends through suitable openings in the bed andhas its opposite end projecting outwardly in a transverse direction tothe bed and the rockof the rear side of the bed and pivotally connectedto the forked portion at the upper end of one arm of a bell crank leverI01. The other arm of the bell crank lever I0! is in the form of a forkwith each portion of the fork pivotally connected to .the upper ends ofvalve rods I08 and I09.

As previously mentioned, 'both the shafts 92 and 93 are rocked to threedifferent positions by movements of the control lever 95 in twodifferent directions, and in order to hold the shafts in such positionssuitable spring points, indicated at H0 in Figs. 18 and 20, are providedwhich engage in downward extensions in the bell cranks I02, I 01.

The valve rods I03 and I04 are slidably supported in a valve housing IIIand carry at their inner ends valve bodies H2 and H3 which move inunison in separate valve chambers Ill and H5. The valve rods I09, I09likewise are slidably supported in the same valve housing II I and haveat their inner ends valve bodies H6 and I II which reciprocate in unisonin separate valve chambers H0 and H9, as clearly shown in Fig. 19.

Valve bodies II2 and H3 are moved by .the movement of the lever 95 in aplane parallel to the ways of the bed to rock the shaft 92, as alreadystated, and saidbodies control the passage of fluid under pressure froma suitable source, not shown, to a fluid motor I20 arranged on the topof the cover of the head'(see Fig. 2) and oneratively connected to thelever 58*, which is secured to'the vertical shaft 58 that actuates theequalizer bar 5B which,- in turn, affects the inward and outwardmovements of the spools and controls the clutch for operating the shaft55 and indexing the spools and dial.

The movements'of the valve bodies IIB, II'I occasioned by the movementof the control lever ing of the shaft 93 control the passage of fluidunder pressure from the source previously referred to, to a fluid motor|2I also located on the top of the cover of the head (see Fig. 2) andoperatively connected to a lever 41 which is secured to the upper end ofthe vertical shaft 41 that actuates the shifting yoke 45 for the mainclutches in the drive to the work spindle.

The valve housing III is illustrated as housing two independent sets ofvalves of two valves each, namely, the set including the valves havingthe valve bodies II2, I I3 and the set including the valves having thevalve bodies H6, H1. The housing III is provided with inlet passages I23communicating with the valve chambers H4. H5

and H9; H9 midway between ends of said chambers. Similarly, the housingIII is provided with exhaust passages I25 communicating with the upperand lower ends of the valve chambers in each set of valves, namely, withvalve chambers I, H5 and H8, H9, respectively. The inlet passages areconnected by suitable piping I26 to the source of supply of pressurefluid, while the respectively, with the valve chamber H5.

outlet or exhaust passages are connected by suitable piping I2'I to anexhaust (see Fig. 18)

Referring to the diagrammatic illustration of Fig. 21, it will be seenthat the two sets of valves have been separated and are shown in sectiontaken along the irregular line 2I-2I of Fig. 20, while the fluid motorsI20 and I2I are shown in section and connected by the conduits to thevalves. The fluid motor I20 which effects the inward and outwardmovements of the spools and the engagement and disengagement of theclutch for the indexing drive for the spools is a two piston motor, aswill now be explained.

The main or primary piston I28 is connected by a piston rod to the lever50' and operates in a cylinder I29. The secondary piston I30 of themotor I20 is substantially larger in diameter than the primary piston I28 and operates in a cylinder I3I separate from the cylinder I29, saidpiston I30 having an abutting pin I32 which is slidably supported in anopening in the partition between the cylinders I29 and I 3I and incertain positions of the piston I30 extendsinto the cylinder I29 to forman abutting stop for the primary piston I29. Ports connected with theopposite ends of the cylinder I29 are in communication with conduits I33and I34 which communicate, The opposite ends of the cylinder I30 are-incommunication by means of suitable ports with conduits I35 and I36,which communicate, respectively,

' with the valve chamber III.

When the lever 95 is in the full line position as shown in Fig. 16, thespools are in their most inward position and the valve bodies H2 and H3are in the positions shown in Figs. 19 and 21. At this time the conduitI34 communicates with the space between the two flanges of thevalve bodyII3, as does the inlet passage I23, and, therefore, pressure fluid isacting on the underside of the primary piston I28, as viewed in thedrawings, to hold said piston in its uppermost position, it being notedthat the conduit I33 which communicates with the cylinder I29 above thepiston communicates with the valve chamber II5 below the valve body andwith the exhaust outlet I 25. The conduit I35 communicates with thespace between the flanges of the valve body H2 and with the inletpassage I 23, wherefore the pressure fluid is acting upon the undersideof the secondary piston I30 to hold'the latter in its uppermost positionwith the abutting pin I32 extending its maximum distance into thecylinder I29, while the conduit I36 which communicates with the cylinderI3I above the piston I 30 is in communication with the valve chamber Illbelow the valve body and with the exhaust outlet When the control lever95 is moved to position G, as shown in Fig. 16, the valve bodies H2 andI I3 are moved fromthe position shown in Fig. 21 to the position shownin Fig.'23. During this movement the upper flange on the valve body II3passes to the opposite side of the conduit I39, which conduit is now incommunication with the exhaust passage I 25, while the lower flange onthe valve body passes below the inlet for the conduit I33, whereforesaid conduit is now in communication with the space between the flangesand with the inlet passage I23. In order to simplify the drawings theconduits have been illustrated in Figs. 22, 23, 24 and 25, but the portopenings corresponding to the conduits have been given the samereference numbers. It will be seen that the fluid pressure is acting onthe upper side of the primary piston|25 of the motor I to move saidpiston downwardly to cause movement of the spools toward their 'outerposition, it beingnoted that the conduit I34 is now in communicationwith the exhaust side of the ,valve. It will be noted. however, that themovement of the valve body H2 in unison with the valve body III has notchanged the relationship of the conduits I35 and I35 with respect to theinlet and exhaust passages of the valve, and that, therefore, the fluidpressure is still acting on the underside of the secondary piston I30 tohold the same in the position shown in Fig. 21 with its abutting pin I32extended a maximum distance into the cylinder I23. The piston I25,therefore, will move downwardly in the cylinder I29 until it strikes theabutting pin I32, and since the secondary piston I30 is of greaterdiameter than the piston I25, the pressure acting on the piston I30 issuflicient to stop the further movement of the piston I23. The stoppageof the movement of the piston I by the abutting pin I32 takes placeafter the spools have moved partway to their outer position, butbeforethe clutch controlling the drive of the shaft 55 and the indexingmovement of the spools has become engaged.

The control lever 95 now being moved from dotted line positionG todotted line position F. the valve bodies H2 and H3 are moved from theposition shown in Fig. 23 to the position shown in Fig. 22. At this timethe movement of the valve body II2 has caused a variation in therelationship between the conduits I35, I35 with respect to the valvebody, as shown in Fig. 23, from the relationship shown in Fig. 22,wherein the conduit I35 is connected to the exhaust side of the valve,while the conduit I35 is connected to the inlet side of the valve; Itwill now be found that the pressure-fluid is acting through the conduitI35 upon the upper side of the secondary piston I30, while the lower endof the cylinder I3l is in communication through the conduit I35 with theexhaust, wherefore said piston I will .move downwardly until it abutsthe lower end of the cylinder and the abutting pin I32 will extend intothe cylinder I23 a minimum distance and allow the piston I23 tomove-downwardly its maximum distance, inasmuch as the pressure fluid isstill acting on the upper side of the piston I20. It will be noted thatthe relationship between the passages I33 and I34 and the valve bodyII3, as shown in Fig.23, has not changed during the movement of saidvalve body to the position shown inFlg. 22. This further movement of thepiston I25 imparts movement to the spools to bring thesame to their mostoutward position and "to engage the clutch which controls the drive tothe shaft 55 for indexing the dial and spools. The engagement of theclutch continues until the spools and dial have been indexed and thepins 5i! or 50 have engaged the stop pin 5I, after which a slippage willtake place in the clutch ,until the operator moves the control leverfrom position F to position G, which will restore the valvebodies I I2,II3 from the position shown in Fig. 22 to the position shown in Fig. 23,whereiore the piston I30 will be moved to the. position shown in Fig.21, and due to the area diflerential between the primary and secondarypistons the former" will be moved upwardly by the abutting pin I32 toshift the spools partially inwardly.

Of course when the one rotation clutch is employed to index the dial andspools the operator will move the control lever 35 from the full lineposition in Fig. 16 to the dotted line position F,

are connected by conduits I and tion F to position G, it beingunderstood that during the latter part of the movement of the lever fromthe full line position to position F that the roller 55 is withdrawnfrom the cam block 51", thus allowing the clutch member 31 to move toclutch engaging position, while the movement of the lever from positionF to position G restores the roller retracting mechanism to its inactivecondition, with the result that after one revolution of the clutchmember the roller again engages the cam block 51 and thus automaticailydisengages the clutch member 51.

When the lever 95 is moved from position G to the full line position, asshown in Fig. 16, the valve bodies H2, H3 move from the position shownin Fig. 23 to the position shown in Fig. 21, at which time the conduitI34 is connected with the inlet side of the valve so that the fluidpressure is then acting on the underside of the primary piston I23 andmoves said piston to its and then immediatelymove said lever from posi-I uppermost position, the conduit I33 communicating with the cylinderabove the piston and with the exhaust side of the valve. The movement ofthe valve body I I2, however, does not change the relations ip of theexhaust and inlet passages with respect to the secondary piston I30, andsaid piston is retained in the position shown in Fig. 21 by the fluidpressure acting on the underside thereof.

The movementof the piston I25 to its uppermost position from out of itsabutting relation with the abutting pin I32 acts to move the spools 55,55" to their most inward position to shift the pins nected with the gearcones in the spindle drive.

It will be seen that when the lever 95 is moved from the full lineposition in Fig. 16 to position G the spools are moved outwardlysufliciently far to clear the pins 5|, 5I and 52, and that when thelever is moved from position G to position F thespools are moved totheir most outward position and the clutch for the indexing drive isengaged and the spools and ,dial are indexed. It will further be seenthat when the lever 05 is moved from position F to position G, assuminthat the dial and spools have been located in their predeterminedpositions, the clutch is disengaged and the setting or presettlng hasbeen completed,

5|, 5|" and 52. which are operatively con- 8 operating in a cylinderIII. The motor III is provided with a secondary piston I33 of largerdiameter thanthe primary piston and operating in a cylinder I40 whichis. operated from the cylinder I35, the secondary piston I33 having anabutting pin Ill which is somewhat longer than theabutting pin I32previously referred to. The opposite ends of the cylinder I35 areconnected,

II3, while the opposite ends of the cylinder I40 I with the valvechamber IIO.

When the lever is in position N, as shown in,

by conduits I32 and I33 with the valve chamber 10 Fig. 15, the mainfriction clutch is in neutral, jg

and it will be noted that fluid pressure is acting on the underside ofthe piston I31 through the conduit I43 which communicates with"the valvechamber II8 between the flanges of the valve body H6 and with the inletpassage I23, while the conduit I 42 communicates with the valve chamberH8 and the exhaust passage I25 (see cylinder I below the secondarypiston I39 and being in communication with the valve chamber and withthe exhaust passage I25. It will be understood that the primary piston131 is now abutting the pin I 4| and its upward movement has beenstopped midway of the cylinder I38.

The operator, when he moves the control lever 95 from position N in Fig.15 to the full line position to rock the shaft 93 to obtain forwardoperation of the spindle, shifts the valve bodies H5 and H1 from theposition shown in Fig. 21 to the .position shown in Fig. 25. It will benoted that at this time the conduit I42 communicates with the inlet sideof the valve, and .hence the fluid pressure acts on the upper side ofthe piston I31 to move the latter downwardly, as viewed in Fig. 21, thelower side of the chamber I38 being connected with the exhaust side ofthe valve through the conduit I 43. This movement of the control lever95 from position N to full line position, as viewed in Fig. 15, does notchange the relationship between the conduits I44 and I and the inlet andexhaust passages of the valve, and hence the secondary piston I39remains in the position in which it is shown in Fig. 21.

The movement of the piston I31 downwardly,

as viewed in thedrawings, rocks the lever 41! and causes the clutchmember 4Il to move into engagement with the clutch member 40 to giveforward rotation to the work spindle. When the operator moves thecontrol lever 95 from the full line position in Fig. 15 to position N orback to neutral position, the valve bodies H5 and H1 move from theposition shown .in-Fig. 25 to the position shown in Fig. 21, at whichtime the piston I31 is moved upwardly by the pressure fluid acting onits underside until it engages the abutting pin I carried by thesecondary piston I39, it being remembered that the secondary piston isof 'larger'diameter than the primary piston and hence the movement ofthe primary piston I31 will be arrested by the pin I4I.

The control lever 95 now being moved from position N to posit on R, asshown in Fig. 15, to reverse the operation of the work spindle, thevalve bodies IIS and H1 move from the position shown in Fig. 21 to theposition shown in Fig. 24.

It will be noted that conduit I45 is now in communication with the inletside of the valve, while conduit I44 is in'communication with theexhaust side thereof, wherefore fluid pressure is applied to theunderside of the secondary piston I39 and moves said piston upwardlyuntil it abuts the motor housing at the end of the cylinder, the

abutting pin I4I now extending into the cylinder I38 a minimum distance.The movement of the valve bodies H6 and H1 from the position shown inFig; 21 to the position shown in Fig. 24 does not affect therelationship between the inlet and exhaust sides of the valves and theconduits I42 and I43, wherefore fluid pressure is still applied to theunderside of the primary piston I31 and the latter, now that theabutting pin I is moving upwardly, moves to its most upward position inthe cylinder I33 and rocks the lever 41 in a direction such that theclutch member 40 moves into clutching engagement with the clutch member40' and hence through the idler gear 40 the work spindle is driven in areverse direction. When the clutch 40 is to be restored to neutral tostop the spindle drive,'the lever is moved from position R to positionN, whereupon the valve bodies H6, H1 move from the pos'tion shown inFig. 24 to the position shown in Fig. 21, while the primary piston I 31and secondary piston I39 move from the positions just described to. thepositions shown in Fig. 21, at which time the clutch member 43 isshifted to a position where it is disengaged from the clutch members 40and 40.

It will be noted that both fluid motors I20 and Ill include a primarypiston and a secondary piston and that the pistons in each motor arecontrolled by individual sets of two valves each movable in unison, withthe inlet and exhaust ports so arranged that the primary pistons of themotors are given two distinct and independent successive movements ineach direction. The relationship of the inlet and exhaust ports withrespect to the valve bodies is changed either at h the beginning or atthe conclusion of each movement of the valve bodies in unison, whereforesaid valve bodies may have a substantial latitude of -movement whereintheir relationship, with respect to the exhaust and inlet passages, isnot varied. In other words, the inlet and exhaust ports of the valvesareso arranged that as the valve bodies move in unison the relationshipbetween said ports and one of the valve bodies is changed at thebeginningof the movement, while the relationship between said ports andthe other of the valve bodies is not changed until the completion ofsaid movement, that is to say, that after the relationship has beenchanged with respect 'to the first valve the valve body thereof movesthrough the i rer'riainder of the movement without causing any change inthe relationship. wh le the valve body of the second valve moves throughthe greater portion of the movement of the valve bodies withouteffecting any change in the relationship, inasmuch as such change takesplace just prior to the completion of the movement of both bodies. Thisarrangement, it will be noted, holds good for the movement of the valvebodies in unison in both directions.

The successive and independent -movements given to the primary pistonsof the motors enable said pistons to rock the levers to which they areconnected to any one of three difierent positions, wherefore the spoolsmay be moved outwardly to a position where the projections thereon clearthe pins 5|, 5| and 52, while the indexing clutch remains disengaged, orthe spools may be moved in the same direction to their most outwardposition to cause an engagement of the clutch and an indexing of thespools.

It is also possible to cause a movement of the spools inwardlysufliciently far to effect a disengagement of the indexing clutch, thisbeing the time when selecting or preselecting of spindle speeds has beencompleted, and then the spools may be moved to their most inwardposition to effect a shifting of the gear cones to obtain a change tothe selected or preselected speed.

In the same way movement of the primary pis-, ton I31 in the motor I2Ienables the clutch mem-

